Double carbureter for explosive-engines.



PATBNTED Nov. 19. 19o?, NT.

No. 871,741. i

' T. L. L T. J. STURTBVA DOUBLE CARBURBTER FOR EXPLOSIVE ENG INES.

APPLIGATION FILED MAB.14. 1907.

2 SHEETS-SHEET l.

I V v v A 'A a. I. 'n .0. v. VA

No. 871,741. PATENTED NOV. 19, 1907.

T. L. & T. J. STURTEVANT-- DOUBLE CARBRETER FOR EXPLOSIVE ENGINES.

APPLIOATION FILED 1v1-A114. 1907. l

2 SHEETS-SHEET zV 'tfurrsn sra'rss rafrnnfr orrrcls.

THOMAS LEGGlS'lT S'FUR'IEVN'P, OF QUIXCY, AND THOMAS JOSEPH STL'RTEVANT, OF

f NElJLESLlCL MASSE-XMMSlTTS. ASSIUXOPS TU BTERTEYANT MILL COMPANY,

PORTLAND, MAINE, A CORPORATION Ol" MAINE.

DOUBLE GARBURETER FOR EXPLOSIVE-ENGINES.

ne. sv 1,741.

Specification of Letters Patent.

` latented Nov. 19, 1907'.

-llpplication filed March 14. 1907. Serial No. 362,313.

all wlwmolt muy concern: Y

,Be it known that we, 'lnoMAs LEGGET'I ifl'rturrnvnnr and 'lnorhis Josnrn S'rin'rrzmirra", citizens of the United States. residing, respectively, at Quincy and Wellesley, in the county of Norfolk and State ol' Massachusetts, have invented or discovered certain new and useiul lniprovenwnts in louble Carbureters for lilxplosii)1i-Engines, of whit-,inthe following is a specilication, reference .Being had therein to the accompanying' drawings,

itis well known to those familiar with explosion gas engines that while the mixtures el air and gas produced by the carhuretcrs may vary widely and 'yet explode with considerable force, certain proportions of air and of the vaperized hydro-carbon are required to produce inaxiniuni economicv el`- iects, or, in other` words, to obtain tho great- ,est ai'nouutl of power from a given quantity of fuel; and various improvements in carhureters have been made so as to render them more or less automatic in their operation thereby to 'secure changing requireaccording to changing engine speeds or conditions.

To properlm.v :vapori/"Le the. gasolcne or other hydro-carbons used in these engines requires a strong current of air in order to thoroughly vaporize the liquid and thoroughly ini): it withl the air. The inward air movement is iinluced bythe suction of the pistons of the motors, and .v-hcn the pistons reciprocate slowly the current of air is niore or less sluggish .and incapable oi properly raising, pul4 verizing, evaporating, and mixing the hydrocarbon with the air, so that a badly prepared mixture is drawn into the engine 'cylinders and explodes, if at all, inefi'ectively,

lwith the usual accoinpaninients of had coinhustion jand waste of the liquid hydrocarbon.

li to produce'ia strong air jet with slow piston movement the air passage of thev car- ;ureter into which the carbureter liquid is contracted air tube results, with a corre? spending reduction in' the piston speed and eihoiency. i In such case, however, the

V'sprayed is of sniall size, so as to give an spraying mixture is properly prepared and the motor starts easily and runs` well at slow speeds,l but at higher speeds such contracted air passage is objectionable owing to back resist-ance to the suction.. Il, however, 'the air passage be inade sulliciently large t'o provide for high speeds of the engine the spraying and pi'ilverijaing eil'ect 1s not proper y proportioned to low engine speeds.

rlhe present invention has l'or its object to provide a carbiueter in which the objections above indicated will be avoided, and by which at low engine speeds a rapid but comparatively sinall current of air, for ell'ecting -the proper carburization, will be produced, but which will also allord ample air passage irorn' the carburetor to the engine for high s eeds', so that whatever inay he the speed o the engine`A the niost ellicient carburization will result.

This invention is carried into eil'ect by providing a double carburetor, or a pluralitewv of carbureters, one of which can be connected with the outlet to the engine through a relae tively small passage so that a relatively highspecd current of air., to produce proper car'- buriz ation, will result when the engine is first started or when running -at low speeds, but which will also provide a large air passage through the throttle valve ironi one vor more carbureters when the engine is running at high speeds. ln other words, in the preferred iorin of the invention, two carbureters of different sizes communicating with the outlet to the engine will be. provided, the

'chambers of these carbureters opening into a connnon passageway or ehani'ber conununieating with the engine or with a passage or outlet to the engine preferably through what may be termed a union or receiver' in which a throttle valve is located, said throttle valve being otl such construction as to provide a comparatively snill air. passage troni the smaller carburetor and a comparaL tively large air passage from the. larger carburcter to the outlet to the'engine, as .may be desired the larger passage being closed when the smaller passage is first opened, while the smaller' passage may be either open or closed when the larger passage is open, as may be desired, and which will be -controlled by the particular' forniof the throttle valve which 105 may beuemployed.

t In the'accompanying drawings, Figure 1 illustrates, the invention in'connection with two' carbureters of dierent sizes, both of which communicate with a union -which provides an outlet passage from both carbureters to the engine, the throttle valve in this view being shown as closed, so that neither carbureter will be in communication with the outlet passa e. Fig. 2 is a detail view of the union with t ie throttle valve mounted therein, and showing said valve in position to form communication between the .smaller carbulreter and the outlet passage to the engine.

Fig. 3 is a view similar to Fi r 2 showing the throttle valve turned in suclh position as to 'form' communication between both carbuy reters and the outlet to the engine. Figs. 4, 5

and 6 are detail views illustrating a slightly different form of throttle valve from that shown in Figs. 1, 2 and 3, and with the valve turned to different positions. Fig. 7 is a deltail lperspective view of the throttle valve. Fig. 8 is a view similar toFig. 1, but with the carbureters partly in section to'show the automatic air valve.

Referring to the drawings, 12 and 13 re resent two carbureters of well-known form, ut of different sizes.

. carburetcrs both communicate with a chainand the passage to the engine, said union- .baffle connected by webs 2] and 22.

.ber in what may hetcrmed a union 14,

which provides means for forming `a s'uitablc connection betweenboth of said carburcters comprising a larger passage 1 5 communicatlngv with the" larger carburetor 12, and a` smaller passage i6 communicating with the smaller carbureter 13. In these passages n lates or valves 17 may be located, if desire( closing The uiion 14 has anv outlet 1S- which forms part of the passage to the engine for the cari Located in the chamber of the' u reted air. u-nion 14 is the throttle valve 19 which is pivotal ly mounted on suitable trunnions, or oth-- erwise, and Vwhich may comprise side disks 20 The said passages or passageways 15and 16 are preferably at right angles to each other, as shown,

for convenient cooperation `with the said throttle-valve. Said webs'21 and 22 form separat-e passageways through the said throttle val-ve so as to alford a restricted or small passageway through said valve from the smaller 'carburetcr when the passageway l5 from the larger carbureter is shut oil', thereby.`

`insuring a high speed eurrent,'of small lvolu me, when only-a small fuel supply to the engine is required. This throttle valveis rovided with an arm or handle 23 which-wi l be suitably connected4 with a manually or automatically controlled operating lever.

Referring to the construction shown in Figs. l, 2 and 3, when the throttle valve is in the position 'shown in Fig. 1 the passages 15 The chambers of thesefor the purpose of wholly or partly the same under certain conditions(v and. 16 from the carbureterswill' ie both closed or shut oil fronrthe outlet passage 1S, but when the said valve is turned to the position shown in Fig. 2 the larger passage 15 will still be closed while the smaller passage 16 from the smaller carbureter will be sage 18. When the valve is turned to the position shown in Fie. 3 both passages 15 and 16 leading from both carbureters will be in communication with the outlet/passage 18.

Iii the construction shown iii Figs. 4,5 ltid 6 both passages 15 and 16 will be closed to the outlet passage when the valve is iii the position shown in Fig. 4; wheiithe valve is 1n the position shown in Fig. 5 the larger pasi sage 15 lwill be closed to the outlet passage and the smaller passage 16 will b e open to said outlet passage. But when the valve is in the position shown in Fig. 6 the smaller 'placed in communication with the outlet pas passagesl will be closed to` the outlet pasv sage, andthe larger` passage 15 will-be placed in communication with said outlet passage.' It -will'therefore be understood that the present invention provides means whereby when the engine is to be run slowly',

and only a small volume'oi' the carbureted mixture 1s desired, a swift air current will be maintained so as to produce a proper carburizatiom but when the engine is to be run fastera suliciently large passage from vthe carbureter to the outlet passa e to the cneine willbe provided so that tiere will not ie any objectionable frictional resistancefto the passage of the carbureted liuid., oiznnv drag upon the engine ,due to improperhcli resistance to the suction. It wilVVA derstood tha't in addition to theadva'ntage l vot seeuringuniform mixtures at a wide range of engine speeds the present construction also presents the advantage that in case one.

carbureter should become damaged or deranged the other can still be. used las inordinary practice, while at ulltinies economyr in ,fuel can be secured owing to the fact that the exj'ilosive,A mixture roducedwill be as near to the maximum e ciency point as possible.

The union 14 is' refera ly emp oyed in connection with a p urality of automatic carbureters or vaporizers, or carbureters or vaporizers provided with automatically-opiiio erated air-valves which regulate the intenmost elicient and economical proportions of positions to cause the-outlet 4passage from to different positions tocause the voutlet pas- -sage from the sald chamber of said union to with a chamber and with separate passageduced bythe engine, againstetl'ie stress of A said spr,1vngs, and thereby admit Aquantities of air'pro ortional to the suction, and'also regulate t 1e partial vacuum in the' spraying chambers,as isrequrcd'to secure the best or the explosive gaseous -mixture of airand vaporized gasolene or oil. l 1.1avin thus described our invention We claim an( desire to secure by Letters Patent: 1. 'The combination with a plurality of carbureters or vaporizers, of a union having an outlet and provided with a chamber and with separate passages leading from said carvalve in the said chamberof said union, said and being adapted to be moved te different the chamber of said union to be placed in. communication, With either or both ofthe said passages from the carbureters- 2.' The combination With'a plurality of earbureters or vaporizers of. a union having an outlet and provided with a chamber and with separate passa es" leading from said earbureters to the c amber of said union, and avalve in the 4said chamber of said union, said valve having separate passagestherethrough and being capable of being moved be laced in communication with either or bot of the passages from the carbureters, the passages in sald union leading from the chamber thereof to the chambers of the earbureters being provided with regulating 3. The combinationiwith a plurality Vof carbureters or vaporizers of di'erentsizes, of a union having an outlet and provided ways of di'erent sizes ieding from said carbure ers to said chamber, and avalve in. said chamber having s `aarate passaveways of different sii-es there-t1 rough, and ihih valve is- 'adapted to be placed in cor? nunication with either or all of the-difiere it sized passageways from said carbureters ,to said chambenA 4. The combination with a ilurality 4of earbureters or vaporizers of difierent sizes, of a union having a vchambenan outlet and separate passageways of different sizes from said carburet-ers into said chamber, and a; valve in' said cham ber having separate pasi sages of different sizes therethrough, andl which valve is adapted to be placed in coml munieation with either or all of the dilerent l sized assageways from said carbureters to f .said eilmniben'the passages in said unioni leading from the chamber thereof to tlicl vlaam'oers of the carburf-.ters being provided, wil l: regulatingmeans.

. 5. The -combinationi'with a'plurality of carbureters or vaporizers of di erent sizes,

- of'a union provided with a chamber and with separate passageways of different sizes, and at right angles to each other, leading from said carburcters or vaporizers to said chamber, and a valve in the said chamber of said union and\vhich valve serves to control or regulate the quantity of fuel mixture delivered to the engine.

6. The combination with a plurality 'of carbureters or vaporizers, of a union" having a chamber communicating with said carbureters or vaporizers, andl a valve in the said chamber of said union and having separate' passageways of different sizes therethrourh, said valve serving to control or regulate tbhe amount of the fuel ixture delivered to the enginefrom each of said carburetersor vaporizers.

7. 'lhe combination with a plurality of automatic carbureters or vaporizers, of a union-having a chamber and havin(r also separate passages communicating with said,

carbureters or vaporizers, and a valve in the saidl chamber of said union constructed to afford separate passageways of different sizes therethrough, said valve serving to control or regulate the amount of-fuel mixture delivered to the engine.

8. The combination with a plurality of automatic carbureters or vaporizers, of a union having an outlet and provided with a chamber and with separate passages' leading from said carbureters to the chamber of said union, and a valve in the said chamber of said union, said valve being constructed to afford separate passages therethrough and being capable of being moved, to different positions to cause the outlet passage frolnthe said chamber of said union to be placed in communication with either or both of the passages fromthe carbureters, the passages 1n said union leading from the chamber thereof to the chambers of the carbureters being y provided with regulating means.

9.-The combination with a plurality of carbureters or vaporizers of different sizes or capacities and each of which is provided With an automatically-operated air-valve, of a common receiver'o iening to the engine and to which said ear ureters deliver the vaporized fuel, and means for preventing or restraining more or less the assage of vaporizcd fuel from either of sait automat-ic carbureters or vaporizers to said common fuel receiver.

1U. The combination with a4 lurality of carbureters or yaporizers of di 'erent sizes and each provided with an automaticallyoperated air-valve, of a union or chamber connnunicating by separate inletvpassages with each of said carbureters` l l1. The combination with al plurality 0f and each provided 'with an automati callyoperated air-valve, of a union. or chamber e communicating by separate inlel passages with each of said carbureters, and a valve in the said union -or chamber 'adapted to be moved to different positions to open 'or close the said passages. A

tures, in presence of two Witnesses.

THOMAS LEGGETT STURTEVANT THOMAS JOSEliI lSIURTEVMI'I. lVii'tnesses: W. H. ELLIS, L. H. STURTEVANT. 

